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Passing Data with Custom Events in AS3

/ Published in: ActionScript 3
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This is an event class that lets you package related events together and send custom data with the event, very useful for MVC applications.

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  1. package utils  {
  2. 	import flash.events.Event;
  3.  
  4. 	public class CustomEvent extends Event 
  5. 	{
  6. 		/*	Place as many events as you want to include in this class  */
  7. 		public static const EXAMPLE_EVENT:String = "exampleEvent";
  8. 		public static const ANOTHER_EVENT:String = "anotherEvent";
  9.  
  10. 		/* 	Create properties to hold data that you want to pass with your event  
  11. 			Include as many as you like.  */
  12. 		public var dataObj:Object;
  13.  
  14. 		public function CustomEvent(type:String, dataObj:Object = null) 
  15. 		{
  16. 			this.dataObj = dataObj;
  17. 			/*	Call the super function which fires off the event 
  18. 			set the event type, bubbling and cancelable properties  */
  19. 			super(type, false, false);
  20. 		}
  21.  
  22. 		/*	Duplicates the instance of the event */
  23. 		override public function clone():Event
  24. 		{
  25. 			/*	This is the event that will be received by your handler function	*/
  26. 			return new CustomEvent(type, dataObj);
  27. 		}
  28. 	}
  29. }
  30.  
  31. /********** To use this class would look something like this **************/
  32.  
  33. /*	Dispatch event with data to be passed
  34. dataObj.name = "test data";
  35. dispatchEvent(new CustomEvent(CustomEvent.EXAMPLE_EVENT, dataObj));
  36.  
  37. /*	 Listen for your custom event
  38. addEventListener(CustomEvent.EXAMPLE_EVENT, handleExample);
  39.  
  40. /*	 Handle your custom event with custom data
  41. function handleExample(event:CustomEvent):void {
  42. var mydata:Object = event.dataObj;
  43. }
  44.  
  45. /*************************************************************************/

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